1083871991 has 2 divisors, whose sum is σ = 1083871992. Its totient is φ = 1083871990.

The previous prime is 1083871961. The next prime is 1083872011. The reversal of 1083871991 is 1991783801.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1083871991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1083871961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541935995 + 541935996.

It is an arithmetic number, because the mean of its divisors is an integer number (541935996).

Almost surely, 2^1083871991 is an apocalyptic number.

1083871991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1083871991 is an equidigital number, since it uses as much as digits as its factorization.

1083871991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 47.

The square root of 1083871991 is about 32922.2112106705. The cubic root of 1083871991 is about 1027.2102188762.

The spelling of 1083871991 in words is "one billion, eighty-three million, eight hundred seventy-one thousand, nine hundred ninety-one".